Battery cell, battery, and electric apparatus

Abstract

A battery cell includes a housing, an electrode assembly, a one-way valve, and a cover member. The housing has a wall portion, the electrode assembly is accommodated within the housing, and the one-way valve is disposed on the wall portion. The one-way valve has an exhaust port, and the exhaust port is configured to discharge gas from inside the housing. The cover member is mounted on the wall portion. Along a thickness direction of the wall portion, the cover member is located on a side of the one-way valve facing away from the electrode assembly, and the cover member covers the one-way valve. An exhaust passage is formed between the cover member and the wall portion, and the exhaust passage communicates the exhaust port to an exterior of the housing.

1 . A battery cell comprising:
 a housing having a wall portion;   an electrode assembly accommodated within the housing;   a one-way valve disposed on the wall portion, wherein the one-way valve has an exhaust port, and the exhaust port is configured to discharge gas from inside the housing; and   a cover member mounted on the wall portion, wherein along a thickness direction of the wall portion, the cover member is located on a side of the one-way valve facing away from the electrode assembly, and the cover member covers the one-way valve, wherein an exhaust passage is formed between the cover member and the wall portion, and the exhaust passage communicates the exhaust port to an exterior of the housing.   
     
     
         2 . The battery cell according to  claim 1 , wherein along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, the first surface is provided with a mounting groove, a groove bottom surface of the mounting groove is provided with a mounting hole, at least a portion of the one-way valve is disposed within the mounting hole, and at least a portion of the cover member is accommodated within the mounting groove. 
     
     
         3 . The battery cell according to  claim 2 , wherein the exhaust passage comprises a first exhaust gap, the first exhaust gap is formed between the cover member and a groove side surface of the mounting groove, and the first exhaust gap is configured to connect the exhaust port and the exterior of the housing. 
     
     
         4 . The battery cell according to  claim 3 , wherein an outer peripheral surface of the cover member comprises a first corner surface and at least two first side surfaces, and the first corner surface connects two adjacent first side surfaces; and
 the groove side surface of the mounting groove comprises a second corner surface and at least two second side surfaces, the second corner surface connects two adjacent second side surfaces, each second side surface is connected to one first side surface, and the first exhaust gap is formed between the second corner surface and the first corner surface.   
     
     
         5 . The battery cell according to  claim 4 , wherein the first corner surface and the second corner surface are both arcuate surfaces, and a radius of the first corner surface is greater than a radius of the second corner surface; and
 the first side surface is welded to the second side surface.   
     
     
         6 . The battery cell according to  claim 4 , wherein a cross-section of the cover member perpendicular to the thickness direction of the wall portion is rectangular, the outer peripheral surface of the cover member comprises four first side surfaces and four first corner surfaces, and the first exhaust gap is formed at least one of the first corner surfaces. 
     
     
         7 . The battery cell according to  claim 3 , wherein the outer peripheral surface of the cover member is provided with a groove, and the first exhaust gap is formed between a groove bottom surface of the groove and the groove side surface of the mounting groove; and
 a region of the outer peripheral surface of the cover member not provided with the groove is welded to the groove side surface of the mounting groove.   
     
     
         8 . The battery cell according to  claim 3 , wherein the outer peripheral surface of the cover member is provided with a plurality of protrusions, the protrusions are spaced apart along a circumferential direction of the cover member, the protrusions abut against the groove side surface of the mounting groove, and the first exhaust gap is formed between a region of the outer peripheral surface of the cover member not provided with the protrusions and the groove side surface of the mounting groove; and
 the protrusions are in interference fit with the groove side surface of the mounting groove. 
 
     
     
         9 . The battery cell according to  claim 3 , wherein the exhaust passage further comprises a second exhaust gap, the second exhaust gap is formed between the cover member and the groove bottom surface of the mounting groove, and the second exhaust gap communicates the first exhaust gap to the exhaust port. 
     
     
         10 . The battery cell according to  claim 9 , wherein along the thickness direction of the wall portion, the cover member has a second surface facing towards the one-way valve, the second surface overlaps the groove bottom surface of the mounting groove, the second surface is provided with a first groove, and the second exhaust gap is formed between a groove bottom surface of the first groove and the groove bottom surface of the mounting groove; and
 a plurality of first exhaust gaps are formed between the cover member and the groove side surface of the mounting groove, the plurality of first exhaust gaps are spaced apart along a circumferential direction of the cover member, the second surface is provided with a plurality of first grooves, and each first exhaust gap is connected to one first groove.   
     
     
         11 . The battery cell according to  claim 10 , wherein the second surface is further provided with a second groove, the plurality of first grooves are disposed around the second groove and communicate with the second groove, and the second groove communicates with the exhaust port; and
 along the thickness direction of the wall portion, the exhaust port is disposed at an end of the one-way valve facing away from the electrode assembly, the exhaust port is disposed facing towards the second groove, and a projection of the exhaust port is located within the second groove.   
     
     
         12 . The battery cell according to  claim 2 , wherein along the thickness direction of the wall portion, the cover member does not extend beyond the first surface; and
 the cover member has a third surface facing away from the one-way valve, the third surface being flush with the first surface.   
     
     
         13 . The battery cell according to  claim 2 , wherein along the thickness direction of the wall portion, the one-way valve does not extend beyond the groove bottom surface of the mounting groove. 
     
     
         14 . The battery cell according to  claim 1 , wherein the cover member is fixedly connected to the wall portion. 
     
     
         15 . The battery cell according to  claim 1 , wherein the one-way valve comprises:
 a valve body disposed on the wall portion, wherein a mounting cavity is formed in an interior of the valve body, the valve body is provided with an intake port and the exhaust port, the intake port is configured to communicate the mounting cavity to an interior of the housing, and the exhaust port is configured to communicate the mounting cavity to the exhaust passage;   an elastic member disposed within the mounting cavity; and   a sealing member movably disposed within the mounting cavity, wherein the sealing member is configured to seal the intake port under the action of the elastic member and to open the intake port under the action of gas inside the housing.   
     
     
         16 . The battery cell according to  claim 15 , wherein the valve body comprises:
 a valve main body disposed on the wall portion, wherein the valve main body is provided with the intake port; and   a valve cover, wherein along the thickness direction of the wall portion, the valve cover is disposed at an end of the valve main body facing away from the electrode assembly, the valve cover and the valve main body together enclose to form the mounting cavity, and the valve cover is provided with the exhaust port; and   along the thickness direction of the wall portion, the valve cover and the sealing member are spaced apart, two ends of the elastic member respectively abut against the valve cover and the sealing member, and the intake port is disposed on a cavity bottom surface of the mounting cavity.   
     
     
         17 . The battery cell according to  claim 15 , wherein along the thickness direction of the wall portion, the mounting cavity extends through an end of the valve body facing away from the electrode assembly to form the exhaust port, and the cover member faces towards the exhaust port; and
 along the thickness direction of the wall portion, the cover member and the sealing member are spaced apart, two ends of the elastic member respectively abut against the cover member and the sealing member, and the intake port is disposed on a cavity bottom surface of the mounting cavity.   
     
     
         18 . The battery cell according to  claim 1 , wherein the housing comprises:
 a housing body, wherein a receiving cavity with an opening is formed therein, and the receiving cavity is configured to accommodate the electrode assembly; and   an end cap closing the opening;   wherein the end cap is the wall portion; or   the housing body comprises the wall portion.   
     
     
         19 . A battery comprising the battery cell according to  claim 1 . 
     
     
         20 . An electric apparatus comprising the battery cell according to  claim 1 , wherein the battery cell is configured to provide electrical energy.